Furnace.



PATENTED MAY 28, 1905.

P. o. ARMSTYEAD.

PURNAGB. APPLICATION FILED MAB.7, 1904.

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AIIORN EY yPATENTED MAY 23, 1905.

` f P. o. ARMSTEAD.

"FURNAGR 4 APPLIATIQN FILED MAR. 7, 19,04. v

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. 4 ATTORNEY UNITED STATES.

Patented'May 23, 1905.

- PATENT OFFICE.

FRANK C. ARMSTEAD, NEW YORK, N. Y., ASSIGNOR TO THE WESTING- HOUSE MACHINE COMPANY, A CORPORATION OF PENNSYLVANIA.

FURNACE- SPECIFICATION forming part of Letters Patent No. 790,339, dated May 23, 1905.

Application filed March 7, 1904. sarai No. 196,966.

.To @ZZ whom it may concern:

Be it known that I, FRANK C. ARMSTEAD, a citizen of the United States, and a `resident of New York, inthe coun-ty ofNew York and State of New York, have invented a new and useful Improvement in Furnaces, of which the following is a specification.

My invention relates to furnaces which are provided with mechanical stokers or devices for continuously feeding fuel thereto, and more especially to furnaces of the class referred to which have inclined grates, to the upper ends of which the fuelis fed, fuel-hoppers attached to the metal front walls of the furnaces, and feed-openings in said front walls through which the fuel passes from said hoppers.

rlhe object .of my invention is to provide a simple and efficient means for preventing injury to the metal front furnace-wall by heat, one member of which is a sectional throatplate having special structural and functional characteristics.

In the accompanying drawings, Figure l is a view in central longitudinal section of the upper part of a furnace embodying the invention, showing the fuel-hopper, the upper part of the grate, the arch over said grate, the feed-opening, and the associatedparts. Fig. 2 is a face view of the part ofthe metal front wall of the furnace shown in Fig. 1 with the fuel-hopper in vertical section. Fig. 3 is a sectional view taken upon line 3 3 of Fig. l, showing in front elevation the fire-arch and horizontal row of fire-bricks between said firearch and the front wall of the furnace. Fig. i-is an enlarged detail plan section taken on line 4 4 of Fig. l. Fig. 5 is a detail vertical section of the front wall of the furnace, taken upon line 5 5 of Fig.` 4. Fig. 6 is a rear elevation of the parts shown in Figs. 4 and 5 with the lire-bricks removed.

As shown in the drawings, A A indicate the side walls of the furnace; B, the metal front wall thereof; C, the upper part of the inclined grate; D, the fuel-hopper; E, the fire arch, which extends over the forward part of the grate, and F F a horizontal row of lire-bricks located between the curved main part of the lire-arch and the front wall of the furnace and which constitutes the forward part of the arch structure.

The grate C, as illustrated, consists of a series of rocking grate-bars arranged in stepped or overlapped relation, and in connection therewith devices may be provided for giving oscillatory or rocking motion thereto; but inasmuch as any form of inclined grate may be employed a detailed illustration thereof `is deemed unnecessary.

The fire-arch E is inclined downwardly and inwardly in the same general direction as the inclination of the grate below it and is made of stepped form on its under surface, so as to present a plurality of ridges which extend across the furnace and form shoulders or abrupt surfaces facing toward the front of the furnace. The spring of the arch is greater at the inner than at the outer part thereof, or, in other words, the front part ofthe arch is flatter than the rear part. The arch consists of a series of rows E to E8 of fire-bricks shaped like the voussoirs of an arch and arlranged in stepped relation, so as to give a downward and inward inclination to the arch as a whole. The live rows E to E5 of firebricks at the forward part of the arch have their under surfaces at the crown of the arch4 at the same level, but are of gradually-increasing spring or curvature from front to rear, while the rearmost rowsE, E7, and EE are of uniform spring or curvature.

Referring to the parts more immediately concerned with the present improvements, the feed-hopper embraces two side plates D D', which are attached to the front wall of the furnace, and a bottom D2, which rests upon two inwardly-extending iianges or ledges UZ Z at the lower margins of the side plates. That part of the front wall of the furnace which is below the hopper is formed by plates B' BiB, and the portions of said wall at the ends of the hopper are formed by lateral plates 132132, while the portion above the central part of the hopper is formed by an intermediate plate B3. The front wall is provided with a feed-opening formed between the plates B, B2 B2, and B3. The bottom plate D2 of the feed-hopper extends inwardly over the plates B B' B2 to form the dead-plate D* and is bolted to the outer su rfaee of said plates B and B4 Bf. rl`he plates B2 B2 extendy inwardly above the said feed-opening, the intermediate plates B and B3 below and above the opening being shorter than the width of said opening.

As shown in the drawings, the plate B' is attached at its ends to the plates B'i B" by means of vertical connecting-bars b b, bolted to both plates. rlhe lateral plates B2 B2 are provided with sight-openings b, with pokerdoors b2, and with offset flanges b3 b3 at their lower edges, which overlap the plates Bl B2, and are also provided along their vertical edges above the feed-opening with offset fianges ZJ* bf, which overlap the ends of the intermediate plate B3 and are bolted thereto. As shown in the drawings, the side plates D' of the hopper are provided with outwardlyextending fianges CZ and CZ 2, which are respectively bolted to the lateral plates B2 B2 above the level of the feed-opening and to the plates B4 B4 below the level of said opening. The top margin of the feed-opening is formed by a sectional throat-plate consisting of a series of sections G G, which are bolted to the outer faces of the plates B3 and B2 B2 by bolts g g. Said sections G are provided with rearwardlyextending horizontal flanges G' G', which are transversely corrugated. The plates B3 and B2 B2, constituting the part of the front wall above the feed-opening, are provided on their rear or inner faces with vertical ribs g g', and the fire-bricks F F, which fill the space between the curved rear or main part E of the fire-arch and the said front wall of the furnace, are of rectangular form in cross-section and have their outer faces in contact with the ribs g g', while they rest at their lower edges on and are supported by the corrugated flanges Gr Gr'. In this structure the said fire-bricks F fit closely between the front edge of the front row E of fire-bricks in the fire-arch and the inner ribbed faces of the plates B2 B2 and B3 and are held in place by said plates and the curved part of the arch. The spaces or channels between the ribs f/ gf, together with the depressions or grooves in the upper surfaces of the corrugated fianges Gr' G', which support the fire-bricks F F, form a series of spaces or passages, as clearly seen in Figs. 4, 5, and 6, through which air is drawn downwardly and inwardly between the said firebricks and the front wall of the furnace in order to keep the metal parts above the feedopening from becoming injured by excessive heat. The construction described has the additional advantage that thev fire-bricks F F are not made of special or unusual shape, but

are of ordinary rectangular form and are supported in place n'lerely by being confined between the front wall of the furnace and the front of the curved portion of the fire-arch and without any special supporting means for their rear ends. The external structure of the throat-plate permits of renewal of any section thereof if injured by heat without disturbing the other sections, and the corrugated form of the bottom or supporting fiange of the sectional throat-plate reduces its liability to warp under the action of the heat to which it is subjected.

Many of the structural details which l have illustrated and described are not essential and may be therefore varied within considerable limits without departing from my invention.

I claim as my invention4 1. The combination with the metal front wall of a furnace provided with a feed-opening and with vertical ribs on its inner face above said feed-opening, of a throat-plate having an inwardly-extending, horizontal, transversely-corrugated flange, and a plurality of fire-bricks which rest upon said corrugated fiange in contact with the said ribs.

2. A furnace having a front wall provided with a feed-opening and with vertical ribs on its rear face above said opening and a throatplate fastened to the said wall at the upper side of the feed-opening and having a rearwardly-projecting, corrugated flange at its lower edge.

3. A furnace having a metal front wall provided with a feed-opening and with vertical ribs on its rear face, a throat-plate fastened to said wall at the upper side of the feedopening and having a rearwardly-projecting, corrugated fiange at its lower edge and a row of fire-bricks supported on said flange.

et. A furnace having a metal front wall provided with a feed-opening and with vertical ribs on its inner face, above said opening, a sectional throat-plate fastened to said wall above the feed-opening and having a rearwardly-projecting, corrugated fiange, and a row of fire-bricks supported upon 'said flange.

5. A furnace having a metal front plate provided with a feed-opening and with vertical ribs on its inner face above said opening, a sectional throat-plate fastened to said front plate above the feed-opening and having a rearwardly-projecting fiangc and a row of fire-bricks supported upon said ffange.

6. A furnace having ametal front plate provided with avfeed-opening and with vertical ribs on its inner face above said opening, a sectional throat-plate fastened to said front plate above said feed-opening and having a rearwardly-projecting, corrugated flange, a row of fire-bricks resting upon said flange and against said front-plate ribs and a firebrick arch extending rearwardly from said row of fire-bricks.

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In testimony whereof I have hereunto subscribed my name this 15th day of February, .1904.

FRANK C. ARMSTEAD. Witnesses:

W. L. MURRAY, E. D. vNEWKIRK. 

